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(No Model.) 2 Sheets-Shet 1. E. R. SIE'IIIBIIUS-l i BOILER.

No. 549,031. Patented Oct. 29, 1895.

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(No Model.)

E. R. STBTTINIUS. BOILER.

No. 549,031. r Pa l l I Il ll l 'sented-001;.29,1895.l

IlNrrn .rares EDWARD R. STETTINIUS, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE STIRLING COMPANY, OF

SAME PLACE.

BOILER.

SPECIFICATION forming part of Letters Patent No. 549,031, dated October 29, 1895.

Application tiled April 15, 1895.

To aZZ'u/hom it may concern:

Be it known that I, EDWARD R. STETTINIUS, a citizen ofthe United States, residing at Chicago, Illinois, have invented a new and useful Improvement in Boilers, of which the following is a specitcation.

The object of my invention is to improve the Stirling type of boiler by providing for the passage of water from the front upper' xo drum to the rear upper drum; and the invention consists in the features and combinations hereinafter described and claimed.

In the accompanying drawings, Figure l is a central vertical sectional view of an ordinary Stirling boiler provided with my improvement; and Figs. 2, 8, 4., and 5, similar views illustrating modications.

A is the lower mud -drumg B B', elevated steam and water drums, and B2 an elevated zo water-drum, which in some cases may also be a steam and water drum; C, C, and C2, banks of tubes connecting the elevated drums with the lower mud-drum; and b, h', and b2, steam and water pipes connecting the several ele- 2 5 vated drums.

As generally constructed, an ordinary Stirling boiler consists, essentially, of. elevated steam and water drums, a lower mud-drum, and banks ot' tubes connecting the steam and 3o water drums with the lower mud-drum, proper steam and water communication being also provided between the several elevated steam and water drums. As the front bank of tubes and the front upper drum are subjected to the highest heat, the water is hottest in this part of the boiler and of course most steam is generated therein. ln order to induceproper circulation, it has been common to provide for the passage of water back from the front up- 4o per drum into the middle upper drum, and

for this purpose suitable pipes communicating with the water-space in each of these drums have generally been employed. Inthis way provision is made for a powerful circulation from the lower mud-drum, up the front bank of tubes tothe t'ront upper drum, across through the water-circulating pipes to the middle upper drum, down through the middle bank of tubes to the lower mud-drum,

5o and so on in circuit. -It has never been the practice, however, to provide for conducting Serial No. 545.774. (No model.)

the mingled water and steam back from the front upper drum to the rear upper drum so as to enable it to mingle with the feed-water and again pass down through the rear bank of tubes into the lower mud-drum. On the contrary, it is generallybeen considered advisable to have no water communication between the rear upper drum and the front and middle upper drums, except through the lower 6o mud-drum, and as a result to provide for only a local or secondarycirculation in the rear drum and bank of tubes. In my improvelnent, however, I provide forcirculation of water from the front upper d rum to the rear upper drum, this circulation being through pipes inside the furnace and outside the middle upper drum, or. connecting therewith, so that the circulation is independent of the middle upper drum or through the same, as 7o desired.

In the form of boiler shown in Fig. l I provide for a continuous circulation down through the rear bank of tubes to the lower mud-drum, up through the front bank of tubes to the front upper drum, across through water-circulating pipes to the rear upper drum, and so on in circuit. I do this byvconnecting suitable pipes h2 to the water-spaces of the front and rear upper drums, respect- 8o ively. These water-pipes may be made to take the place of the water-pipes b now used to connect the front and middle upper drums, in which case there will be' no direct communication between the waterspaces ot the S 5 front and middle upper drums, or they may be used in addition to the present water-pipes, in which case the water-space of the front upper drum will have direct communication with the water-spaces of the middle and rear 9o upper drum, respectively. In the former case the main circulation is up through the front bank of tubes to the front upper drum, across to the rear upper drum, down through the rear bank of tubes to the lower mud-drum, and so on incircuit, while the local or secondary circulation is in the middle upper drum and middle bank of tubes. In the latter case there are two general circulations, each partaking somewhat of the nature of a main cir- Ioo culation, but no local or secondary circulation, these terms being used not technically but in a general sense and to indicate the general course of water in the boiler when under normal operation.

In Figs. 2, 3, 4, and 5 I have shown various modifications, which will be readily apparent. The most important of these are the use of ordinary circulating-pipes between the rear and middle upper drums the same as between the front and middle upper drums, so as to require the passage of Water through all the upper drums, (see Fig. 3,) and the use of multiple mud-drums communicating with each other (see Fig. 3) or entirely disconnected. (See Figsa and 5.) Various other changes or modifications may be made. For instance, more than three upper drums may be used, in which case Iintend the expression rear upper drum to mean any elevated drum back of the t middle upper drum, this latter expression being used to conveniently designate the drum next or adjacent to the front upper drum; and although it willv gen` erally be found advisable to have thewaterf circulating pipes enter the rear upper drum above the level of the water therein they-,may enter either above or below such` water-level, as desired.

A5111@ Hotel, 01 distinguish-ieg feature; 0f, myinvention consists in providing f or cornmunication between the water-spaces of the front and rear upper drums and changingthe circulations accordingly, it will of course be understood that I d o not intend to limit iny-` self to minor features or detain-lsI of construe tion. On the contrary,I contemplate chang-V ing form a-nd construction, omitting parts or using equivalents, as circumstances may suggestor render expedient.

I am aware of the Wheeler patent of December 15, 1891;` but my invention differs from the one therein shown in several re-` spects, particularly in that the pipes connecting the upper drums of the Vheeler boiler. are outside the furnacef-by which I mean the entire space or chamber containing the.

heated Agases and not any particular part thereof--while the pipes connecting the upper drums of my boiler are inside the furnace, and in that said pipes connecting the upper drums do not perform the same functions in the two boilers, the Wheeler pipes not being s subjected to the heat of the furnace and consequently having but little steam therein, and my pipes being subjected to such heat and carrying mingled steam and water from the hottest parts of the boiler.

I claim 1.V In a water tube boiler, the combination of a lower drum, or drums, three elevated drums, banks of tubes connecting the lower drum or drums with the elevated drums, and a pipe or pipes inside the furnace connecting thefront and rear elevated drums, whereby water may circulate from front to rear, substantially as described.

In afwater tube boiler, the combination of a lower drum or drums, three elevated drums, banks of tubes connecting the lower drum. or drums with` the elevated drums, a pipe or pipes inside the furnace connecting the front and middle elevated drums, and a pipe or pipes inside thefurnace connecting the front and rear elevated drums, whereby watermay circulate` from, front tol rear, substantially asdescribed.

In a water tube boiler, the combination of a lower drum or drums, three elevated drums, banks of tubes connecting the lower drum or drums with4 the elevated drums, a pipe or pipes inside the furnace connecting the front and middle elevated drums, and a pipe or pipes` inside thefurnace connecting the rear and middle elevated drums, whereby water may circulate through all the elevated drums, substantially as described.

IvEa LEE, W. S. Lucas. 

